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23#
發表於 2009-3-26 01:29 PM
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pure math5.39.217.77/ y' \. W# Z4 e, S* ]) p& Z7 ]
# i5 a9 _2 Q1 W. f* e. Q9 A$ B8 S" y5.39.217.77[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y: u* o) G/ V9 |
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if x = 111 y = 2222, you number is 111-2222 |
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